* {
    margin: 0;
    padding: 0;
}

body {
    font-family: "Microsoft YaHei", "Heiti SC", tahoma, arial, "Hiragino Sans GB", "宋体", sans-serif;
}

a {
    color: white;
    text-decoration: none;
}

ul {
    list-style: none;
}

.auto-center {
    width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.full-center {
    min-width: 1000px;
}

.pull-left {
    float: left;
}

.pull-right {
    float: right;
}

.clearfix::after {
    content: '';
    display: block;
    clear: both;
}